都市植物為決定都市中其他生物棲地結構與品質的關鍵因素，為都市生物多樣性的基礎。近年都 市景觀生態的探討中，已開始有學者針對建成環境裡的細緻空間異質性進行研究，但都市中自然與半 自然環境的異質性則尚未被探討。本研究擬利用三年期間，以不同尺度的植物物種歧異度與其分布探 討都市綠地中的細緻空間異質性，檢討傳統應用於自然地區的植物調查方法在都市綠地這樣高度為人 類配置的空間中應該如何調整，同時也藉此解析出都市綠地中的植物同質單元，分析其驅動因子。研 究課題包括：1) 在都市綠地中以航照圖推定斑塊範圍，並以斑塊中心隨機選取樣框的做法，是否充分， 最常漏掉的資訊是什麼，需要如何調整都市綠地中樣框配置的策略? 2) 在都市公園如此高度人工配置 的空間中，其空間異質性有何特性，在樣框的設置上，有哪些自然地區調查所不會出現的現象，需要 加入調查規範之中? 3) 不同類型的綠地與綠地斑塊，其物種-面積曲線的累積情形有何異同? 不同類型 的綠地與綠地斑塊分別需要多少樣框面積才能捕捉到大部分的物種資訊? 4) 不同類型的綠地與綠地 斑塊，其物種歧異度在時間與空間的拆解情況如何，有哪些驅動因子最能解釋這些時空變異?
The urban flora determines the structure and quality of urban habitats and forms the foundation for urban biodiversity. Recent developments in urban landscape ecology have highlighted the importance of fine-scaled heterogeneity in urban environments. However, such developments have focused more on the built environments and the finer-scaled heterogeneity in urban natural or semi-natural environments are yet to be studied. This three-year study proposes to study plant diversity as a means to analyzing the fine-scaled heterogeneity in urban natural environments. In the process, we will also review the appropriateness of using plant survey methods originally developed for natural areas in such highly human modified areas, and propose amendments for application in urban environments. Through the identification of finer-scaled plant-determined patch types, we will proceed to study the drivers of plant diversity in urban environments. Research questions include: 1) What kind of information is missed by using aerial-photograph-based patch delineation as the basis for survey plot arrangement in urban greenspaces? 2) How does spatial heterogeneity differ between highly human arranged spaces versus natural areas, and how should survey methods originally developed for natural areas be modified in urban areas? 3) How does the accumulation of area-species curves differ among different types of greenspaces and green patches? 4) How does diversity partitioning differ among different types of greenspaces, green patches, and seasons? From this, what can we derive about the drivers of urban plant diversity?
